Engraving machine



July 24, 1.923.

' c. c; BRucKNER ENGRAVING MACHINE Original Filed Aug. 17 1920 5Sheets-Sheet l July 24, 1923;

, 1,462,682 C. C. BRUCKNER ENGRAVING MACHINE Original le A 17. 1920 5Sheets-Sheet 2 almi 4 July' 24, 1923. 1 1,462,682 c. c. BRUCKNERENGRAVING MACHINE Original Filed A g. 17/1 26 5 Sheets-sheaf rs al foz nei y '7 July.2 4, 1923. 1,462,682

C- C. BRUCKNER ENGRAVING MACHINE 0riginal Filed Aug. 17. 1920 5Sheets-Sheet 4;

a ugmtogwi-I Y 1.462.682" c. c. BRUCKNER v ENGRAVING MACHINE July 24,1923.

bri inal Filed-Aug. 17, 1920 '5. Shets-Sheet 5- Patented July 24, 1923.

cairn!) STATES treat an 111" etch.

CHARLES C. BRUCKNEB, OF JERSEY CITF, NEW JERSEY, ASSIGNOR T0 ERUGKNERMFG. 00., INC., A CORPORATION OF DELAWARE.

ENGRAVING MACHINE.

Application filed August 17, 1920, Serial No. 404,247. Renewed May 26,1922. Serial lto. 563,980.

To all whom it may concern:

Be it known that I, CHARLES C. Bauer.- NER, a citizen of the UnitedStates, and a resident of Jersey Cit in the county of Hudson and Stateof blew Jersey, have invented certain new and useful Improve.-

ments in Engraving Machines, of which the;

following is a full, clear, and exact description.

This invention relates to engraving machines, and has for its object toprovide a' machine by which commercial engraving, such as practiced byjewelers, card-plate engravers, etc., can be done entirely automaticallyby unskilled operators, and in fact without attention by the operatorother than placing the work in the machine and setting movement into'andout of cutting engage-' ment with the work, the movement of the tool toengrave thedesired design being effected electrically from a patternover which a stylus is moved in coordination with the movement of thework.

The machine of that patent produced satisfactory work when properlymanipulated, but required constant attention from the operator as wellas skill in setting and operating the machine. The machine of my presentapplication is much simplified in construction and is provided with anoperating motor and connections whereby after the machine is once set inmotion it will continue in operation until the design has beencompletely engraved, stoppin automatically when the work is finishe Thisfeature of the machine is particularlyimportant in engraving in relief,that is, with the design raised in a sunken field. With this class ofwork the machine will automatically stop when the field beyond thedesign has been cut equal in width to the field at the side where thework was commenced.

One of the principal disadvantages heretofore prohibitive of thesuccessful commercializing and general use of machines of this type hasbeen the fact that in all such machines, the electrical operation of theundue cutting tool has been efi'ected by makin or breaking the toolcontrolling electric cir uit at the point of contact between the tracerand the pattern. This necessarily resulted in sparking at-the contactoint with consequent burning and injuryboth to tracer and pattern. Aspecific object of this invention therefore is the provision of suchcircuit controlling meansat a point. entirely removed from the point atwhich the tracer and pattern contact. At the same time, means isprovided for the elimination of friction betwee n the pattern andtracer.

Another importantfeature of the present machine is .the J, provision ofdevices for facilitating the centerin of the machine with regard to thewor to be engraved. These devices permit the design, without previousmeasurement, to be laced with its center at any predetermine point onthe -work to be engraved, that is to say, the .operator has merely todetermine the center novel features of construction and design whichwill be hereinafter described and.

pointed out in the appended claims.

In the drawings 1 have illustrated a preferred form of my improvedmachine, and

in the said drawings,

Figure 1 is a plan view thereof;

Fig. 2 is a front elevation of the machine shown in Fig. 1;

Fi 3 is an end elevation looking from the right of Fig. 1;

Figs. 4 and 5 are side and front elevations, respectively, on anenlarged scale of a portion of the slide feed mechanism;

Figs. 6, 7 and 8 are detail views of the stylus and connected parts;

Figs.,9, 10 and 11 are detail views on an enlarged scale of the designor type-holding mechanism;

Fig. 12 is a detail view of the automatic stop mechanism whereby themachine is caused to stop after the design is completely en aved;

. ig. 13 is a diagrammatic view showing the electrical connections;

a drop forged plate with stiffening ribs so as to be light and at thesame time sufiiciently' rigid to maintain the parts in fixed relativepositions. The base late 1 is of general shape as shown in 1g. 1, oneend of'the cross member of the T being longer than the other andproviding a base for the electric motor 2 from which the machine isoperated. The main portion of the base reciprocatl work table 3, whilethe other arm of the carries the type support 4 and associated parts.

The machine comprises a air of guide rods 5 extending longitudinal y ofthe main portion of the base plate and carrying a sliding su port orcarriage 6 which forms the base 0 a post 7 upon which the cutting tool 8and its actuating mechanism are mounted for vertical adjustment by meansof a gear 9 meshing with a rack 10 cut in the rear face of the post. Theslide 6 is adjustable .along the rods 5 by means of a screw shaft 11threaded in the rearface'of the slide and swiveled through a cross bar12 between the rods at their rear ends.

The support 13 for the reciprocating work table is also su ported on therods 5 near I the front ends t ereof for longitudinal adjustment therods to and from the carri plishe by a. screw 14 threaded in the frontweb of the frame 13. The screw 14 is mounted at its forward end in abearingllfi formed in the fixed frame member in w 'ch the rods 5 aresupported The threaded rod 14 is provided at its exposed and with a handwheel 17 for manually adjusting the frame 13 to position the work withrespect to the tool and is also provided with an automaticallyoperatingl mechanism for partially rotating the s aft as the en ravinprogresses to move the work under t e too which mechanism will be laterdescribed. The lliland wheel 17 has a ,lslcale mark En its rip ecooperating wit a, spring nger 1 7 best shown in Figure 4, attached tothe.

along top of the bearing 16. The scale mark is chine, the members beingpositioned to be engaged by the er when the table is centered with thecutting tool,

as will be later described.

The support. 13 consists of two spaced members extending transversely ofthe maconnected b suitable webs in a single rigid piece. T e upperedgesof the spaced members are underknown design.

te supports the cutting mechanism and 6, this adjustment being accom-vcut as shown at 18 (Fig. 4 to provide atransverse guide track for t efeed table 3 which. is reciprocated by the electric motor 2 preferablythrough the driving mechanism shown herein. v

This driving mechanism comprises a worm, 19 on the motor shaft meshingwith a worm wheel 20 on a shaft 21 at right angles to the motor shaft.The shaft 21 car ries a friction wheel 22 which engages the face of a.friction disk 23, the wheel 22 and disk 23 forming a chan e speed gearof well F ormc on the rear face of the disk 23 is a diametrical slideway24 in which is adjustably supported a crank pin block 25 connected by alink 26 with the reciprocating carriage 3 whereby the rotation of thedisk 23 will reciprocate the carriage along its guideway 18, the extentof movement depending on the adjustment of the crank pin in the guideway 24.

The purpose of this ad ustment is to vary the movement of the table inproportion to the size of design to be engraved on the article, and thepurpose of the change speed gear is to allow a faster rotative movementto be imparted to the disk when a short reciprocating movement isimparted to the shde whereby the table may be operated at a uniformspeed of movement for the purpose of securing uniform work and also toallow smaller designs to be engraved in a time prolpgrtionate to theirsize instead of taking t full time required for larger pieces. The disk23 is provided with a scale mark and index finger 23 similar to thefinger 17 to indicate the middle position of the table with respect toits lateral movement.

Thework table 3 preferably comprises an under part supported in theguideways 18 and an upper removable part 27 fixedly connected to thelower part when the machine is in use throu h a dove-tail slide 28 (seeFig. 2) and loc 'ng screw, not shown, so as to be detachable in orderthat different work tables for different t readily substituted.

its reciprocating movement, by means of an adiusting screw 30, theoperation of which wi 1 be later described. The chuck 29 comprises abase having its bottom out to fit the undercut slideway 32 in the tabletop 27 (see Figs. 4 and 5) and an up r part 33 hinged at one side to theedge 0 vided at the other side with an elevating screw 34 whereby oneedge of the chuck may be elevated when necessary to hr the surface of anirre ular piece of wor into an approximately horizontal plane. The chuckproper consists of the usual clamping ieces upported in the part 33 onthe ouble the base and promeacee ing the ratchet wheel is a pawl 37carried in fork 44 which embraces the end of a bell crank lever 38pivoted on the stationary frame adjacent the ratchet wheel. The free endof the lever 38 is con nected through a link 39 with the core of asolenoid 40, the solenoid having in its circuit an automatic switch 41supported on the frame of the driving gear in the manner shownparticularly in Fig. 2. The switch 41 comprises three spring armsinsulated from each other and from the machine frame and normallyseparated by their own resilience, but adapted to be brought togetherwhen engaged by the high part of a cam 42 attached to the shaft of thedisk 23. The high part of the cam 42 occupies half of its circumferenceand is placed with relation to the position of the switch 41 so as toclose the switch when the table begins its return movement, that is, themovement to the right, as shown in Fig. 1, thereby drawing the pawl backas far as permitted by the ad-' ustrnent at which it is set. The switchopens the circuit when the carriage begins its cutting movement,allowing the spring 43 to raise the arm and turn the shaft 14 through adistance equal to one or more teeth of the ratchet, thereby shifting thework with relation to the tool so that another line will be cut" on thenext movement of the table. The tool is raised during the returnmovement of the table and lowered during the cutting movement by anelectro magnet controlled by the third arm of the switch 41, as will belater described. -The stroke of the pawl 37 may be regulated in anysuitable manner, for instance, by the the link 39 and the cooperatingpin 45 which may be set in different holes in the link so that thedownward movement of the link is limited by the position of the pin andthe upward movement by the engagement of the fixed pin 46 with the underside of the fork'44. The holes in the link 39 are spaced so that eachhole corresponds to one tooth of the ratchet. Thc type caw-z'er.

The type carrier 4 is supported on guide rods 50 arranged at one end ofthe cross piece of the base plate in parallelism with the rods 5. Thecarrier 4 is actuated from the carriage 13 by means of a; system oflevers shown particularly in Fig. 1, one of which levers has anadjustable fulcrum whereby loosely,

both'the direction and extent of movement of the type carrier 4 withrelation to the main table 13 may be varied to secure designs ofdifi'erent dimensions from a single set of type. The lever system showncom.- prises a lever 51 with a fixed fulcrum on the base plate in frontof the main table and with one end connected to the table 13 by a link52. The other end of the lever 51 is connected by a suitable link to asecond lever 53 whose fulcrum consists of a pin or screw 54 adapted tobe passed through any one of a number of holes in the lever 53 andthreaded or set in one of a corresponding arrangement of holes in thebase plate on opposite sides of the connection of the lever 53 with thetype carrier 4.- The shifting of the fulcrum from one hole to another ineither group varies the extent of movement of the type carrier and itsadjustment from one side to the other of the connection with the carrier4 changes the direction of movement of the carrier, as will be obvious.

The type carrier 4 (Figs. 9 and 10) consists essentially of a vise orclamp having one side 55 attached fixedly to the base of the carrier 4and a movable side 56 hinged at one end to the base and provided at theother end with a pin to be engaged by a hook 57 pivoted on the base.

The pivot 58 of the lever is preferably mounted to be rotated and isprovided with an eccentric forming the bearing of the hook and with aknurled head so that by turning the pin 58 the hook may be tightened todraw, the part 56 tightly against the type.

The type may be either printers type, that is, showing the letter inreverse, or may be direct reading type as shown in the drawing,depending upon whether the movement of the stylus is in the samedirection as the movement of the feed table, or the reverse direction.The type is set up between the parts 55 and 56 and the latter clampedtoward and away from each other and from V the center of the typecarrier. After the type is centered in the carrier the screw 58 isturned to clamp them fixedly in place.

In Fig. 9 the type is shown as arranged for engraving sunken letters.Where this after which the type is centered by' type of work is doneonly the type need be set in the holder, for the cutting tool is activeonly when the stylus is passing over the raised portion of the type andhence the movement of the stylus beyond the type at each end is withoutefi'ect. When, however, the design is to be formed with raised lettersin a sunken field I preferably use in addition to the tvpe itself,border pieces I such as shown in Fig.- 11. As here shown,

four border pieces are employed, two side pieces above and below thename. The side pieces have their edges adjacent the name out down to thesame height as the field surrounding the letters, to thereby produce oneach side of the type an additional border equal in width to the cutdown portion 65'. The two end pieces 66 have cut out portions 66, of anyshape desired and of a width equal to the width of the type plus the twoportions 65'. Sunken fields are thus provided at each end of theletters, forming with the side recesses a com plete field surroundingthe name and symmetrical therewith.

The stylus.

movement of the stylus and table to be altered. For this purpose thestylus is mounted for reciprocation upon a carriage which reciprocateson a guide rod 68 projecting laterally from the side of the table 3. Therod 68 works through a guide sleeve 69 supported on one of the rods 50of the type-supporting guides for movement along the rod 50 as the table3 is fed forward by the ratchet 36, that is to say, the rod 68 is fastto the carriage 3 and moves with it both laterally and in its forwardand backward movement, while the guide 69 moves backward and forward onthe rod 50 and guides the rod 68 in its lateral movement.

The carriage 70 (Figs. 6, 7 and 8) of the stylus comprises essentially abearing sliding on the rod 68 and a pair of spaced rojections 71 on theupper side of the carnage arranged to receive between them a rock shaft72 with its axis of oscillation perpendicular to the guide rod 68. Thestylus is .attached to the rock shaft and comprises preferably an armprojecting over the type and carrying a vertical finger or feeler 67with its end turned slightly to one side, as shown more particularly inFig. 8, to thereby present a smooth surface to the type as the stylus ismoved over the type by the reciprocation of its carriage. The stylusrests fully on the type, being partially counterbalanced by a projectingarm carrying the armature of a magnet 74 supported on the styluscarriage and connected through the same contacts of the compound switch41 which control the carriage feed so as to be energized throughout thereturn stroke of the carriage when the cutter is inoperative, the effectof the magnet being obviously to raise the stylus and maintain it out ofengagement with the type.

The operating connection between the feed table and the stylus carriagecom- 3 tacts 82 and prises a fulcrum bar 75 projecting rigidly from therear side of the carriage 13 and havin pivoted in its free end anoperating lever 6. The forward end of the lever 76 is pivoted at 77 to,the stylus carriage and its rear end carries an adjustable slide 78'having in its upper surface a crank pin 79 working in a slot in a plateor arm 80 attached to the end of the reciprocating carriage 3.. Byadjusting the slide 78 along the lever 76 the extent of movement of thestylus carriage efi'ected by the movement ofthe carriage 3 willobviously be varied,

thereby permitting designs of various sizes to be engraved from a singleset of type. It will be observed from Fig. 1 that the slot in the arm 80lies parallel with the lever 76 when the stylus is over the center ofthe type. By this arrangement the feed table and stylus will always besimultaneously adjusted to their center position at all positions ofadjustment of the crank arm 79. That is to say, when the hand wheel 17and the disk 23 areadjusted to the center positions indicated by theirindex fingers, the table 3 will be centered with the normal position ofthe tool and the stylus will be at the center of the type holder. Forthe same purpose the lever connections 51, 53, etc. between the table 3and type-carrier 4 are proportioned so that all the holes in the lever53 for the fulcrum pin 54 register with the corresponding holes in thebase board when the hand wheel and disk are adjusted to center position.The machine will therefore produce a design of any desired size from asingle set of type, with that design, whatever its size, symmetricalwith the work as centered under the cutting tool when the hand wheel anddisk are adjusted to the positions indicated. Y

The cutting tool.

The stylus controls the operation of the cutting tool through a. contactdevice carried by the shaft 72 and shown in tail in Figs. 6, 7 and 8,which contact device causes the magnet 81 of the cuttin tool to beenergized and de-energized. s shown, the contact comprises a pair ofinsulated contacts 82, 83, supported on the stylus carriage 70 at oneside of the shaft 72 in the manner shown particularly in Fig. 7 the twocon- I 83 being arranged to co-operate, respectively, with two springcontact fingers 84, 85, supported on the shaft 72in the mannershown. Theupper finger 84 is arrang d. to close the circuit through the contact 82when the stylus is raised in passing over the type and to break thecontact while the stylus is passing over the surface of the type blockbetween the letters, while the lower contact 85 will close the circuitthrough the contact 83 when the stylus drops ofi the letters and breakthe circuit when the stylus is aaeaeaa raised. This double contactarrangement is provided so that the design may be formed in eitherraised or sunken letters from the same v shaft 72 will have noeflect.

The coil of the magnet 81 is also connected to its source of currentthrou h a shunt circuit 89 (see Fig. 13) passing through the lowercontacts of the switch 41 to insure the cutting tool being raised on thereturn or idle stroke of the work table.

The cutting tool 8 is preferably supported in a chuck 91 carried on thefree end of a I bell cank lever 92 as shown particularly in Fig. 3, theupper end of the bell crank carrying the armature for the magnet 81. Themagnet and fulcrum of the bell crank are supported in a' box or casing93 depending from a bracket adjustably secured to the post 7. Alsoenclosed in the casing is the return spring 94, for the tool cuttingarm. This spring is carried by a guide rod supported in the casing 93,the spring being compressed between a fork 95 on the bell crank and anadjusting nut 96 threaded on the rod whereby the compression of thespring may be readily adjusted.

The extent of movement of the armature away from the magnet iscontrolled by an adjusting screw 97 threaded through the outer wall ofthecasing and serving as a stop for the upper end of the bell crank. Byadjusting this screw the depth of the cut effected by thetool may bereadily altered.

The casing 93 is not attached directly to the bracket 8 but is connectedto it for adjustment toward and from the post 7 by means of a gear andrack connection 98 (see Fig. 1) operated through a thumb nut 99 'on theshaft of the gear. Normally the casing is adjusted to its full extenttoward the post 7,*in which position the cutting point of a tool'such asshown in Fig. 1 will coincide with the center of the machine with whichthe adjustments are symmetrical, as described above. When, however, atool with a bent shank such as necessary with some kinds of work, aswill be later described, is employed, the casing will be adjusted awayfrom the post 9 to an extent corresponding with the offset of thecutting tool to permit the point of the cutting tool to be brought tothe center of the machine;

The automatic stop device.

The machine is preferably provided with an automatic stop device tobring the machine to a stop when the engraving iscomplete This mechanismis shown particuarly in Fig. 12 and comprises a pivoted lever 100fulcrumed on an am 101 proj r 119%. ing forwardly from the carriage 6between the guide rods 5 the fulcrum of the arm 100 being immediatelyunder the cutting tool in its normal position. The lever 100 isconnected at its free ends to two sliding sleeves working on the tworods 5, one of the sleeves 102 lying behind the supporting hearing ofthe carriage 13, while the other sleeve 103 is in front of the carriage.The sleeves are connected with the lever by pin and slot connections,the arran ement being such that when one sleeve is slid along its rodthe other sleeve will be moved in the opposite direction along its rodto an equal extent from the fulcrum of the lever 100, the two arms ofthe lever being equal. The sleeves are provided with set screws 104 bymeans of which they may be set in their adjusted positions. J

The sleeve 102 which lies to the rear of the table 13 carries on its"front face a pair of spring contacts 105 insulated from the Theoperation of the machine.

In 0 erating the machine the first step is to a just the hand wheel 17and disk 23 to their center positions as indicated by the indexes 17 and23 which brings the table 13 into its center position with respect tothenormal position of the tool and also adjusts the stylus and typecarriage so that the point of the st us lies immediately over the centerof t e ty The work will then be clamped in El: chuck 29'with the pointon the work with which the design is to be symmetrical, directly .underthe cutting point of the tool, the tool being readily raised and loweredby the rack and pinion 9 and 10 to facilitate the centering of the work.In centering the work with res ect to the tool the chuck may be shiftelaterally back and forth'by means of the screw 30 and the tool may beadjusted back and forth through screw shaft 11 until the desiredadjustment is obtained.

The hand wheel 17 will then be turned to adjust the carriage forwardlyon the guide rods 5 and wlth it the stylus carriage and type carriageuntil the stylus lies in advance of the type to an extent at least equalto the width of the field to he cut sleeve 102 carrying the startingswitch 107 will close to start the machine in motion. Under the o ationof the motor .the carriage 3 .w' be laterally reciprocated through thestroke and at the speed determined by the adjustment of the crank in 25,and the speed ar 22 and the sty us will be moved over e t pe the lengthof the stroke of the stylus epending upon the adjustment of the pin 79in the slot of the arm 80. At the com 'letion of 'each reciprocation ofthe carriage to the right as shown in the drawings, the contact throughthe switch 41 will be broken by cam 42, thereby deenergizing the magnet40, ermitting the spring 43 to elevate the bell crank 38 and adjust thescrew shaft 14: throu ha partial revolution, depending upon t e lengthof stroke permitted by t e adjusting pins 45. The switch 41 completesalso the circuit throu h the m at 74 on the stylus carriage, t erebylifting the stylus out of contact with the type so that on the returnstroke the stylus will be free of the type and the tool will be elevatedby the magnet 81, the circuit through the tool magnet 81 be in closedthrough the lower contacts of switch 41 and shunt circuit indicated at89 in the diagram Fi 13.

The operation 0 the screw 14 shifts the table 3 slightly to the rear toallow the tool to traverse the work in a line closely parallel with thefirst line of movement, the tool being raised and lowered as thecontactsof its. magnet are closed and opened by the stylus in passingover the letters to thereby cut the design either in relief or inintagho, as described. The adjustment of the stop 44 varies the,distance between the lines to be cut by the tool so that closeliadjacent lines may be used in small wor or where the material is such asto re uire it. The movement of the carriage a ong its rods 5 causes anequal movement of the stylus carriage through the connection of the rod67 with the carriage 3, and also a movement of the type carriage 4 inthe same .or opposite. direction, depending u n the position of thefulcrum pin 54, w ereby the design may be vertically -either smaller orlarger than the type, that is, if the type carriage moves in. the samedlrectlon .as the stylus, the relative movementof the type and styluswill not be as large as the relative movement of the work and cuttingtable, whereas if the movement of the type carriage is in the oppositeto the rear of the center a distance equal in width to the movement infront of the center, whereby the machine will be automatically stoppedwith the design in all resplgcts symmetrical with the center of the worAttachments for inc/lined work, etc.

The machine shown and described is also designed to produce an engraveddesign with the letters inclined to the vertical from vertical type sothat vertical, inclined and back hand reproductions may be made from thesame set of type. To this end the feed screw 30 is provided with aratchet feed device which may be used when desired to produce aninclined reproduction and remain idle when a vertical reproduction is tobe reproduced without removing any part from the machine. This mechanismcomprises two ratchet wheels 110 and 111 with oppositely'faced teethfixed to the shaft 30 and the end opposite the hand wheel. Supported onthe shaft between the ratchets for free oscillation about the screwshaft is a lever 112 carrying'two pawls 113 and 114 cooperating,respectively, with the ratchets 110 and 111. The pawls 113 and 114 areeach provided with a leaf spring 115 working against a projection on theback of the pawl for holding the pawl either in or out of engagementwith its ratchet, depending upon the adjust-ment of the pawl.

The lever 112-is operated-by the magnet 40 which controls the ratchetfeed 36 to effect the adjustment of the chuck with relation to the feedtable at the same time the feed table is adjusted.- To this end the link39 which connects the core ofthe solenoid with the bell crank 38 isextended beyond its pivot and connected to the end of the lever 112through a connection permitting relative movement of the lever 112 andthe link 39 in both directions of adjustment of the feed table. As shownin the drawings, these connections comprise a wideyoke 115 formed on theend of the lever 112 and carrying a guide'bar- 116 workin throughar'slot 117, in the upper end of the ink. The width of the yoke 115 issuch as to permit aeaeea the full lateral movement of the feed table,

that is, it is equal in length to the longest line of engraving whichthe machine is designed to produce, while the slot 117 is of a lengthequal to the greatest Width of design which the machine is desi ed toproduce, so that the feed device will not limit the operation of themachine. The upper portlon of the link 39 preferably works through guidepins projecting from the, carriage to prevent binding of the slot 117 onthe guide rod as the feed table is shifted. In operating this device onepawl or the other will be ad usted to. operatively en age its ratchet tothereby give the feed tab e a slight extra motion independent of themovement of the stylus and type carriage upon each operation of thecutting tool, the effect being to either begin the engraving of eachsuccessive line slightly in advance of its normal position, thus glvingit a forward slant, or carry the lower end of the line slightly beyondnormal position to give a rearward slant, depending upon which of thepawls is operative. When a vertical design is to be reproduced from thevertical type, both pawls are adjusted to be inoperative.

In Fig. 15 I have illustrated an attachment of the machine to be usedfor engraving upon a curved surface, such, for instance, as the innersurface of a ring. This attachment consists of a bracket 120 having adetachable connection 121 with the feed table 13, the bracket carryingabearing 122 for a rotary chuck 123 in which the ring or other articleto be engraved may be clamped. The rotary chuck is provided with adrivin gear 124 which is operated by a rack 125 detachably connected tothe feed table 3 for reciprocation with it. The tool employed for thisengraving has its point offset from its shank as illustrated, and inorder that the centering of the machine and the operation of itsautomatic stop mechanism will not be disturbed, the case 93 will beadjusted away from its normal position shown in Fig. 3 an amplitudeequal to the extent of offset of the point of the cutting tool from itsshank.

The construction used in Fig. 12 may. ob-

viously be used also for exterior work I) artic e instead of theexterior.

In Fig. 14 I have illustrated an attachment to' be employed in someclasses of work, for instance, in engraving script letters or similardesigns where the lines cut in the metal should appear unbroken. Theattachment'comprises essentially a mall auxiliary motor supported on afix d bracket arm 131 on the tool supporting carriage. The shaft of themotor is mou ed for vertical adjustinent in its bearings and carries atits lower end a chuck 132 in which the cutting tool is clamped.

The upper end of the motor shaft is-proas it is reciprocated withrelation to the work causes the tool to cut away the metal between thesuccessively engraved lines, thereby producing work of the sameappearance as if hand engraved.

The rotary tool attachment may be used for either intaglio or reliefengraving, as will be obvious.

I claim:

1. In an engraving machine, the combina-. tion of a cutting tool, a worksupport, a pattern holder, a stylus co-operating with the patternholder, a driving motor and connections between said motor and saidfirst mentioned parts for simultaneously imparting correlated relativemovement to said cutting tool and work holder, and said pattern holderand stylus, respectively, said connections comprising means for varyingthe amplitude of movement imparted to the operated parts by the drivingmotor and independent means for varying the speed of movement impartedby said motor.

2. In an engraving machine, the combination of a relatively movablecutting tool and work table, a relatively movable stylus and patternholder, electrical connections til controlled by the movement of thestylus movement for shifting the tool into and out of cuttingposition,means for varying the relative amplitude of the relative movement of thework table and tool, and stylus and pattern, respectively, and means forcausing the cutting tool and work table and the stylus and patternholder to be simultaneously centered in all positions of theiradjustment.

3. In an engraving machine, the combination of a reciprocating worktable, a relatively fixed cutting tool, a stylus, means for yreciprocating the stylusin timed relation to usln a chuck to engage theinterior of the the pattern and stylus to thereby reverse the engraveddesign with reference to the pattern.

4. In an engraving machine, the combination of a cutting too a worksupport, a pat- Ill tern holder, a stylus co-operating with the "worksupport and said stylus and pattern holder to start the engraving at oneside of the center of the design to be engraved and means controlled bysaid adjusting means for automatically stopping the driving motor when adesign symmetrical with the center of the pattern has been engraved bythe tool.

5. In an engraving machine, the combination of a relatively movablecutting tool and work table, a relatively movable stylus and patternholder, electrical connections controlled by the movement of the stylusproduced by the pattern in theirrelative movement for shifting the toolinto and out of cutting position, means for varying the relativeamplitude of the relative movement of the work table and tool and stylusand pattern, respectively, and means for imparting a periodic additionalmovement to the work table to vary the form of design.

6. In an engraving machine, the combination of a relatively movablecutting tool and work table, a relatively movable stylus and patternholder, positive means for accurately centering the tool and work table,and co-operating mechanism actuated by said meansfor centering the saidstylus and the pattern.

7. In an engraving machine, the combination of a cutting tool, a worksupport, a pattern holder, a stylus co-operating with the patternholder, a driving motor, connections between said motor and said firstmentioned parts for'simultaneously imparting correlated relativemovement to said cutting tool and work holder and said pattern holderandstylus, respectively, electrical connections between said stylus andsaid cutting tool for moving the latter into and out of engagement withthe work during the relative movement of thestylus and pattern in'onedirection, and electrically operated means controlled by the drivingmotor for maintaining the stylus out of engagement with the patternthroughout the movement of the stylus in the other direction.

8. In an engraving machine, the combination of a cutting tool, a worksupport, a pattern holder, a stylus co-operating with the patternholder, a driving motor, connections between said motor. and said firstmentioned parts for simultaneously imparting correlated relativemovement to said cutting tool and work holder and said pattern holderand stylus, respectively, and electrical connections between said stylusand said cutting tool for moving the latter into and out of engagementwith the work during the relative movement of the stylus and pattern inone direction, said connections comprising a contact piece carried bysaid stylus,

and a fixed contact piece external to said stylus and pattern andadapted to be engaged by the movable contact upon oscillation of thestylus as effected by said pattern.

9. In an engraving machine, the combination of a cutting tool, a worksupport, a pattern holder, a stylus co-operating with the patternholder, a driving motor, connections between said motor and said firstmentioned parts for simultaneouslyimparting correlated relative movementto saidy cutting tool and work holder and said pattern holder andstylus, respectively, electrical ponnections between said stylus andsaid cutting tool for moving thelatter into and out of engagement withthe work during the relative movement of the stylus and pattern in onedirection, and electrically operated means controlled by the drivingmotor for maintaining the tool and stylus'out of engagement with thework and pattern respectively, throughout the movement of the stylus inthe reverse direction. 10. In an engraving machine, the com bination ofa cutting tool, a work support, a pattern holder, a stylus cooperatingwith the pattern holder, a driving motor, connections between said motorand said first mentioned parts for simultaneously imparting correlatedrelative movement to said cutting tool and work holder and said patternholder and stylus, respectively, electrical connections between said sthis and said cutting tool for moving the atter into and out ofengagement with the work during the relative movement of the stylus andpattern in one direction, said connections comprising two fixedindependent contacts external to said stylus'and pattern,movable'contacts carried by said stylus and cooperating respectivelywith said fixed contact, one of said movable contacts engaging its fixedcontact on the upward movement of the stylus, the other movable contactengaging its fixed contact on the downward movement thereof and meansfor connecting either of said fixed contacts with a source of electricalcurrent-to thereby cause said machine to engrave in relief or intaglioas desired.

11. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, circuitcontrolling means operable; upon contact of the tracer. and pattern andremoved from their point of contact for, electric'ally effectingoperation of the cuttingr moved from their point of contact forelecreeaeea circuit controlling means operable upon contact of thetracer and pattern and retrically efi'ectin operation of the cuttingtool, a rock sha t and supporting means for said tracer fixed to saidshaft.

13. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, circuitcontrolling means operable upon contact of the tracer and pattern andremoved from their point of contact for electrically efiecting.operation of the cutting tool, a

rock shaft, supporting means for said tracer fixed -to said shaft,andsaid circuit controlling means carried by the shaft.

14. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder,

circuit controlling means operable upon contact of the tracer andpattern and removed from their point of contact for electricallyefl'ecting operation of the cutting tool, a rock shaft, supporting meanscomprising an integral angular extension of the tracer.

15. In an engraving machine, a relatively movable cutting tool andworktable, a relatively movable tracer and pattern holder, circuitcontrolling means operable upon contact of the tracer and pattern andremoved from their point of contact for electrically efiecting operationof the cutting tool, and means providing rocking mounting for thetracer.

16. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, circuitcontrolling means operable upon contact of the tracer and pattern andremoved from their point of contact for electrically efiecting operationof the cutting tool, the said tracer mounted to rock in a plane parallelto the plane of the relative movement of the tracer and pattern.

17 In an engraving machine, a relatively movable cutting'tool and worktable, a relatively movable tracer and pattern holder, and a work holdermovable relative to the table, while said table is in movement to varythe form of design.

18. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, a work holdermovable relatively to the table while said table is in movement to varythe form of design, and means for optionally varying the extent of therelative movement.

of the table and work holder.

19. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, a work holdermovable relatively to the table while said table is in movement to varythe to of design, and means for optionally varying the direction ofmovement of the work holder relatively to the table.

20. In an engraving machine, a relatively movable tool and work table, awork holder on the table, and means operable upon movement of the worktable for shifting the position of the work holder upon the table. Y

21. In an engraving machine, a relatively movable tool and work table, awork holder on the table, means operable upon movement of the work tablefor shiftin the position of the work holder upon t e table, and meansfor optionally varying the direction of shifting of the holder upon thetable.

22. In an engraving machine, a relatively movable tool and work table, awork holder Ill on the table, means operable upon movement erationthereof, a. pattern, movable means actuated by engagement withthepattern, and means whereby the movement of said means electricallycontrols the reproducing device. 1

25. In a reproducing machine, a reproducing tool, a relatively movabletracer and pattern, means whereby movement of the tracer caused by itsengagement with the pattern elegtrically controls the operation of thetoo 26. In a reproducing machine, a relatively movable work table andtool, a relatively movable tracer and pattern, means whereby movement ofthe tracer caused by its enga e ment with the pattern electricallyed'ects t e operation of the tool.

27. In a'reproducing machine, a relatively movable work table and tool,a relatively movable tracer and pattern, means whereby movement of thetracer caused by its en 'gagement with the pattern electrically eftilllltlll llll tool holder thereon, of a work table, means forreciprocating the table under the tool holder, means for feeding thetable transversely to its path of reciprocating travel, and means formoving said tool holder away from its support whereby to properly centeroil-set cutting tools relative to work on the table, said meanscomprising a bracket vertically adjustable relative to the support, anda tool casing secured to the bracket and horizontally adjustablerelative thereto.

31. A circuit controlling mechanism for electrically controlledreproducing devices including in combination with a pair of relativelymovable contacts a movable element, a pattern engageable with said.element to eifect movement thereof, and means whereby movement of saidelement effects the relative movement of said contacts;

32. In an engraving machine, a cutting tool, a relatively movable tracerand pattern, means spaced from the point of contact of the tracer andpattern whereby movement of the tracer caused by its engagement with thepattern electrically etlects the operation of the cutting tool.

33. In an engraving machine, a relatively movable pattern and tracer,said tracer mounted to rock in a plane parallel with the plane ofrelative movement of the tracer and the pattern, a cutting tool andmeans whereby rocking of the tracer caused by its engagement with thepattern electrically effects operation of the tool.

34. In an engraving machine, a relatively movable cutting tool and worktable, a relatively movable tracer and pattern holder, driving means forpositively effecting relative movement of said elements, and. a

naeacsa change speed mechanism associated with the driving means.

35. In an engraving machine, a relatively movable cutting tool and worktable, a-

and pattern holder, driving means for positively efli'ect-- relativelymovable tracer ing relative movement of said elements, and a changespeed mechanism associated with the driving means, and means independentof the change speed mechanism for varying the relative amplitude ofmovement of said relatively movable elements.

36. In an engraving machine, a relatively movable cutting tool and worktable, arelatively movable tracer and pattern holder, a stop mechanism,means for adjusting said mechanism to automatically and simulta-jneously stop said relatively movable parts 38. In an engraving machine,the combi- I nation with a cutting tool of a work table, a work holderonthe table, means for reciprocating the work table under the tool, meansfor feeding said work table transversely to its path of reciprocatingtravel upon each reciprocation thereof, means associated with aid lastmentioned means for effecting relative movement of the work holder andtable, said means being adjustable to control the direction and extentof movement between the table and work holder.

39. In a reproducing machine, a relatively movable tracer and pattern,said tracer being mounted to rock in a plane parallel to the plane ofrelative movement of the tracer and pattern.

Signed at New York, in the county of New York and State of New York,this 7th day of August 1920.

CHARLES C. BRUCKNER.

